From 522b1d69219d8f083173819fde04f994aa051a98 Mon Sep 17 00:00:00 2001
From: "Borislav Petkov (AMD)" <bp@alien8.de>
Date: Sat, 15 Jul 2023 13:41:28 +0200
Subject: x86/cpu/amd: Add a Zenbleed fix

Add a fix for the Zen2 VZEROUPPER data corruption bug where under
certain circumstances executing VZEROUPPER can cause register
corruption or leak data.

The optimal fix is through microcode but in the case the proper
microcode revision has not been applied, enable a fallback fix using
a chicken bit.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
---
 arch/x86/include/asm/microcode.h | 1 +
 1 file changed, 1 insertion(+)

(limited to 'arch/x86/include/asm/microcode.h')

diff --git a/arch/x86/include/asm/microcode.h b/arch/x86/include/asm/microcode.h
index 320566a0443d..66dbba181bd9 100644
--- a/arch/x86/include/asm/microcode.h
+++ b/arch/x86/include/asm/microcode.h
@@ -5,6 +5,7 @@
 #include <asm/cpu.h>
 #include <linux/earlycpio.h>
 #include <linux/initrd.h>
+#include <asm/microcode_amd.h>
 
 struct ucode_patch {
 	struct list_head plist;
-- 
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